<template>
    <div class='sub-sort'>
      <div class="sort">
        <a :class="{active:sortParams.sortField===null}" @click="changeSort(null)" href="javascript:;">默认排序</a>
        <a :class="{active:sortParams.sortField==='publishTime'}" @click="changeSort('publishTime')" href="javascript:;">最新商品</a>
        <a :class="{active:sortParams.sortField==='orderNum'}" @click="changeSort('orderNum')" href="javascript:;">最高人气</a>
        <a :class="{active:sortParams.sortField==='evaluateNum'}" @click="changeSort('evaluateNum')" href="javascript:;">评论最多</a>
        <a @click="changeSort('price')" href="javascript:;">
          价格排序
          <i class="arrow up" :class="{active:sortParams.sortField==='price'&&sortParams.sortMethod=='asc'}" />
          <i class="arrow down" :class="{active:sortParams.sortField==='price'&&sortParams.sortMethod=='desc'}" />
        </a>
      </div>
      <div class="check">
        <XtxCheckbox v-model="sortParams.inventory">仅显示有货商品</XtxCheckbox>
        <XtxCheckbox v-model="sortParams.onlyDiscount">仅显示特惠商品</XtxCheckbox>
      </div>
    </div>
  </template>
  <script>
  export default {
    name: 'SubSort',
    setup() {
        const sortParams = {
            inventory: false, //
            onlyDiscount: false,
            sortField: null,
            sortMethod: null
        }
        // 价格排序
        const changeSort = (sortField) => {
            if(sortField === 'price') {
                if(sortParams.sortField === null) {
                    // 第一次点击，默认降序
                    sortParams.sortMethod = 'desc'
                } else {
                     // 其他情况根据当前排序取反
                    sortParams.sortMethod = 'desc' ? 'asc' : 'desc'
                }
            } else {
                // 如果排序未改变停止逻辑
                if(sortParams.sortField === sortField) return
                sortParams.sortField = sortField
                sortParams.sortMethod = null
            }
        }
        return { changeSort, sortParams }
    }
  }
  </script>
  <style scoped lang='less'>
@import '@/assets/styles/variables.less';

  .sub-sort {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    .sort {
      display: flex;
      a {
        height: 30px;
        line-height: 28px;
        border: 1px solid #e4e4e4;
        padding: 0 20px;
        margin-right: 20px;
        color: #999;
        border-radius: 2px;
        position: relative;
        transition: all .3s;
        &.active {
          background: @xtxColor;
          border-color: @xtxColor;
          color: #fff;
        }
        .arrow {
          position: absolute;
          border: 5px solid transparent;
          right: 8px;
          &.up {
            top: 3px;
            border-bottom-color: #bbb;
              &.active {
              border-bottom-color: @xtxColor;
            }
          }
          &.down {
            top: 15px;
            border-top-color: #bbb;
            &.active {
              border-top-color: @xtxColor;
            }
          }
        }
      }
    }
    .check {
      .xtx-checkbox {
        margin-left: 20px;
        color: #999;
      }
    }
  }
  </style>